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Commitments and Contingencies (Details) $ in Millions | 3 Months Ended | 9 Months Ended
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Dec. 19, 2017 claim | Sep. 30, 2019 USD ($) bed facility
Commitments and Contingencies [Line Items] |  |
Estimate of possible loss |  | $ 18.8
Estimated construction capital project cost |  | 193.0
Cost already spent on existing capital projects |  | 143.0
Remaining capital required for capital projects |  | $ 50.0
Number of vacant beds at idle facilities marketed to potential customers | bed |  | 3,000
Number of marketed idle facilities | facility |  | 4,000
Property and Equipment |  |
Commitments and Contingencies [Line Items] |  |
Carrying values of idle facilities marketed to potential customers |  | $ 49.6
Pending Litigation | Immigration Detainees Against Company |  |
Commitments and Contingencies [Line Items] |  |
New claims filed, number | claim | 3 |
WASHINGTON | Pending Litigation | Immigration Detainees Against Company |  |
Commitments and Contingencies [Line Items] |  |
New claims filed, number | claim | 2 |
CALIFORNIA | Pending Litigation | Immigration Detainees Against Company |  |
Commitments and Contingencies [Line Items] |  |
New claims filed, number | claim | 1 |

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